In this paper we describe a new random network generator RanGen for generating activity-on-the-node (AoN) networks and accompanying data for different classes of project scheduling problems. The objective is to construct random networks which satisfy preset values of the parameters
used to control the hardness of a problem instance. Both parameters which are related to the network topology and resource-related parameters are implemented. The new network generator meets the shortcomings of former
network generators since it employs a wide range of different parameters which have been shown to serve as possible predictors of the hardness of different project scheduling problems. Some of them have been implemented in former network generators while others have not. Copies of
the computer program can be obtained from the authors.